Machine for cutting teeth of metallic gear-wheels



(No Model.) v

- G.E.ALBRO. V MACHINE FOR CUTTING TEETH'OF METALLIC GEAR WHEELS IN0.281,819. 1 1a m 3 a l a m an Thwart N. PEYERS. r-howulno m mnWashinflon. D. c

ing with the center of the worm-wheels with shaft.

J is also connected through a train of gears,

UNITED STAT S PATENT FFlQE.

OHARLES E. ALBRO, OF PHILADELPHIA, PENNSYLVANIA.

SPECIFICATION- forming part of Letters Patent No, 281,819, dated July24, 1883.

Application filed October 6, 1882. (N0 model.)

To all whom it may concern:

Be it known that I, CHARLES E. ALBRo, of the city and county ofPhiladelphia, and State of Pennsylvania, have invented an Improvement inGear-Cutters, of which the'following is a specification.

My inventionhas reference to gear-cutters in general, but moreparticularly to that class adapted to cut worms for worm-wheels; and itconsists in securing to the master-wheel shaft of a gear-cutting machinea cutter combined with mechanism whereby said cutter is made to travelat the speed of a tooth of the worm- Wheel adapted to mesh with the wormsaid cutter is cutting, and means to cause said cutter to return to itsoriginal position after passing through the worm-blank without arrestingthe movement of the master-wheel shaft, and in many details ofconstruction, all of which arefully set forth in the followingspecification and shown in the accompanying drawings, which form partthereof.

The object of my invention is to provide means to cut worms forworm-wheels, the teeth of which worms converge to a point coincidwhichthey are adapted to mesh.

My object is, further, to obviate the necessity of the cutter rotatingwith the master-wheel shaft, and in lieu therefor to cause it to make aportion of a revolution and then automatically return to its originalposition.

In the drawings, Figure 1 is a front elevation of my improvedgear-cutter. Fig. 2 is a side elevation of same. Fig. 3 is a plan viewof same, and Fig. 4. is a side elevation of a gear-cutting machinehaving my improved cutter attached thereto.

A is the frame of the gear-cutting machine.

13 is the master-wheel shaft, carrying on one end 'the master-wheel Gand on the other my improved gear-cutter K.

D is the master-wheel worm, and E is its Pivoted to the shaft E are armsF, carrying on its free end and above the cutter K the worm-blank shaftJ, which is driventhrough spur-wheels J J 2 by band-wheel J This shaftG, with the shaft E, whereby a proper relative velocity is given to themaster-wheel shaft.

H is a rack, into which the pinion I meshes,

said pinion being carried upon the frame or arms F, and is used toregulate the elevation of said frame.

To the end of the masterwheel shaft 13, I secure a hub, L, provided witha flange, L.

Encircling the hub L, and resting against the flange L, is an annularring, L provided with extensions L, which is kept in position upon saidhub by a ring-plate, L", held in place by bolts Z.

Pivoted to the ring L at l, and guided by extensions or guides L*, isthe cutter-block L to which is adjustably secured by groove Z thecutter-holder L, which in turn carries the cutter L. a

Extending below the block L and forming part thereof, or securedthereto, is a lug, P, which runs upon or against a pivoted bar, R,curved in the middle, as at R, and pivoted on each end, as .at A, thelateral extensions R of said bar being weighted, as at R, to tend tothrow the parts RR up at all times. In place of weights R springs may beused. A spring,

Z is placed under the lug to force it out at alltimes and keep thecutter L in position for cutting. The upper or free end of the block Lis provided with steel pins L and M M, the two latter being upon itsunder face and projecting toward the flange L, whose face is provided,close to the periphery, with holes M", strengthened by steel bushings M.These holes M extend all around and at given intervals apart, and areadapted to receive the pins M on the block L".,

N is a cam adjustably secured to the frame A, and is adaptedto raise theblock L by pin L so that its pins M are clear of the holes M and also tocause the lug Z to fall inside the bar R and there remain until the pinT 011 ring L depresses said bar, when, by means of spring P, or itsequivalent, it is drawn back, as more fully described hereinafter.

The operation is as follows: A worm-blank,

S, being secured to shaft J and the machine cam N causes the block Lwith cutter L to be raised, freeing its pins M of the holes in theflange L, thus arresting the movement of the cutter L withoutinterfering with the movement of the flange L. As the cutter is raisedthe lug Z is depressed, compressing spring Z and allowing the bar R torise up suificiently to keep said lug depressed and the cutter raised.Whenin this position the spring P or a weight mechanism draws said ringL and its cutter back to its original position, and during said backwardmovement the pin T strikes the bar R and depresses it sufficiently toallow the lug Z to rise and the pins M enter fresh holes M in flange L,said movements being actuated by spring Z". Upon renewing the movementonce more the bottom of the lug Z runs upon the bar R B. As thewormblank is cut it is fed down, either by hand or automatically.

Having now described my invention what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination of flange L, provided with holes M ring L, pivotedblock L, pro vided with extension or lug Z and carrying cutter L springZ, pins M, L and T, cam N, spring P, and weighted pivoted bar R R,substantially as and for the purpose specified.

2. The combination of flange L, provided with holes M ring L pivotedblock L, provided with pins M and carrying cutter L pin or extension Lcam N, spring 1?, or its equivalent, and means to hold said block L upor down, according as to whether it is moving in one direction or theother, substantially as and for the purpose specified.

3. The combination of ring L pivoted block L carrying cutter L andprovided with extension or lug Z spring Z and pivoted bar R,substantially as and for the purpose specified.

4. The combination of master-wheel shaft 13, master-wheel O, worm D,shaft E, traingearing G, shaft J, and cutter, K, substantially as andfor the purpose specified.

Intestimony of which invention I hereunto set my hand.

CHARLES E. ALBRO.

Vitnesses:

R. A. GAVIN, JOHN WV. SEWA'RD.

